Fair Value Measurements (Tables)
 9 Months Ended
Apr. 30, 2019
Fair Value Measurements [Abstract]  
Summary of balance of assets measured at fair value on a recurring basis
  Level 1 (1)  Level 2 (2)  Level 3 (3)  Total 
  (in thousands) 
April 30, 2019            
Debt securities $—  $301  $—  $301 
Equity securities included in other current assets  523   —   —   523 
Equity securities included in equity investments  —   —   3,344   3,344 
Total $523  $301  $3,344  $4,168 
July 31, 2018                
Debt securities $1,692  $3,920  $—  $5,612 
Equity securities included in other current assets  360   —   —   360 
Total $2,052  $3,920  $—  $5,972 

 

(1) – quoted prices in active markets for identical assets or liabilities

(2) – observable inputs other than quoted prices in active markets for identical assets and liabilities

(3) – no observable pricing inputs in the market
Summary of assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
  Three Months Ended
April 30,		  Nine Months Ended
April 30,		 
  2019  2018  2019  2018 
  (in thousands) 
Balance, beginning of period $2,745  $6,300  $—  $6,300 
Transfer into Level 3 from adoption of change in accounting for equity investments  —   —   2,794   — 
Rafael Spin-Off  —   (6,300)  —   (6,300)
Total gains recognized in “Other income (expense), net”  599   —   550   — 
Balance, end of period $3,344  $—  $3,344  $— 
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the period $599  $—  $550  $—